If the Vec name came from an argument, especially from an API parameter, use
H2OColumnNotFoundArgumentException(String argument, Frame frame, String column_name) or
H2OColumnNotFoundArgumentException(String argument, String frame_name, String column_name),
which let you specify the argument name. If not, use
H2OColumnNotFoundArgumentException(Frame frame, String column_name) or
H2OColumnNotFoundArgumentException(String frame_name, String column_name).